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Longer Run Times

So here it is again. I have a stock Summit with 2x7 cell 4200 batteries. I love it and it is awesome. The problem is that I want MORE!!!
I am looking for everyone's opinion on this. Should I:
A) just buy more of the same batteries (I would have to be continually charging and changing them out)
B) go brushless ( would I have gearing/temp issues with the 2 speed trans- would it still be waterproof?)
C) go lipo (I think I would need a new ESC too, wouldn't I?)
D) any other suggestions to increase run times other than drive like a sissy

what brand batteries do you have? My buddy has a pair of 5000mah elite and a pair of 4600mah duratrax 7 cells and he gets about 30 min run time with those. I think that is very impressive for nimh batteries.

2s 8000mAh or 3s 5000mAh are the largest Lipo packs that will fit in the stock battery compartments. If you are going to run the stock ESC, that means two 2s packs. That's the highest voltage the ESC can handle.

I am running 2 true rc 8000 15 C . you havto squeeeeeze them in there but its worth it.
You can always just put them in a zip lock baggie. I have gotten them wet but when i submerge it i just use my nimh